$9x^2-12x+9$
$\left(x^2\:+2x\right)\left(x^2+2x\right)$
$444+555$
$-4x^2+5x-1$
$25\:+\:\left(-5\right)\:-\:\left(-8\right)\left(-2\right)$
$\frac{dy}{dx}=1-2x+senx$
$\lim_{t\to\frac{\pi}{.2}}\left(\frac{1-sin\left(t\right)}{1+cos\left(2t\right)}\right)$
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